Template:Selected anniversaries/July 26
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1502: Christian Egenolff born. He will be the first important printer and publisher operating from Frankfurt-am-Main.
1923: Aircraft designer Igor Sikorsky demonstrates experimental helicopter which is capable of performing simple time travel maneuvers, significantly reducing fuel costs for helicopter flight.
1941: Mathematician and academic Henri Lebesgue dies. He developed a theory of integration which generalizes the 17th century concept of integration (summing the area between an axis and the curve of a function defined for that axis).
2000: Mathematician and academic John Tukey (nonfiction) dies. He made important contributions to statistical analysis, including the box plot.